How to Choose an HVAC Contractor in Arizona

Verify the license yourself

Arizona requires a Registrar of Contractors license for HVAC work above a minimal threshold. The ROC maintains a public lookup where anyone can check a license number in about a minute.

What to look for: that the license is active, that it covers the correct classification for the work, how long it has been held, and whether there is a complaint history.

A contractor should provide the number without hesitation. It should also appear on their truck, their website, and their invoices. Ours are ROC 330516 and ROC 264944, and we would rather you check than take our word for it.

Insurance is a separate question

Two coverages matter, and they protect different things.

General liability covers damage to your property. If a technician puts a foot through your ceiling from the attic — which happens — this is what pays for it.

Workers compensation covers injuries to their employees. This one matters more than most homeowners realize: without it, an injury on your property can become your liability.

Ask for a certificate of insurance. A legitimate contractor produces one routinely, and you can request that it be sent directly from their insurer.

Evaluate the diagnostic process

You cannot evaluate a technician's conclusions. You can absolutely evaluate their process, and process correlates strongly with quality.

Good: asks about symptoms before touching anything, uses gauges and a meter and a thermometer, explains what they found in plain language, gives you a written price before starting, and leaves you with the readings.

Concerning: reaches a conclusion without instruments, recommends full system replacement on a first visit for something that sounds like a component failure, prices the work only after doing it, pressures you to decide immediately, or will not show you the failed part.

What a written proposal should contain

• Equipment manufacturer, model numbers for both outdoor and indoor units, and capacity
• Whether the indoor coil or air handler is included
• Line set handling — reused and flushed, or replaced
• Electrical work: disconnect, whip, breaker sizing
• Condensate drain and float switch
• Any duct work or sealing included
• Permit and inspection
• Removal and disposal of old equipment
• Labor warranty term and what it covers
• Manufacturer warranty term and who registers it
• Total price and payment terms

Bids that lack these items are not comparable to bids that include them. A quote that is several thousand dollars lower frequently differs in scope rather than in value.

Questions worth asking directly

• "Will you perform a load calculation, or are you matching the existing size?"
• "Is the permit included, and do you schedule the inspection?"
• "What is your labor warranty, and what does it cover?"
• "Will you measure static pressure and assess the ductwork before quoting equipment?"
• "What commissioning readings will I receive after installation?"
• "Are your technicians paid commission on what they sell?"

That last question is the most informative one on the list, and a company that answers it directly is telling you something about how they operate.

Reading reviews usefully

Volume and average rating are less useful than pattern. Look for reviews that describe a specific problem and a specific resolution, and look at how the company responded to negative reviews — defensively, or with an attempt to fix it.

Be skeptical of a large number of reviews posted in a short window, and of reviews that read like marketing copy. Be more interested in reviews that mention the same technician by name over several years, which suggests low turnover.

Longevity matters too. A company that has been operating in the Valley for decades under the same name has a reputation that would be expensive to damage.